Energy resources worldwide are depleting at the very high rate and energy conservation is becoming the norm of the day. With stricter energy consumption norms worldwide Energy Efficient Motors are manufactured in IEE efficiency classes (I, II, III) as per customer requirement.
Energy efficient motors, also called premium or high- efficiency motors, are 2 to 8% more efficient than standard motors. Motors qualify as”energy-efficient” if they meet or exceed the efficiency levels listed in the National Electric Manufacturers Association’s (NEMA’s) MG1-1993 publication. Energy efficient motors owe their higher performance to key design improvements and more accurate manufacturing tolerances.
Lengthening the core and using lower-electrical-loss steel, thinner stator laminations, and more copper in the windings reduce electrical losses in Energy efficient motors. Improved bearings and a smaller, more aerodynamic cooling fan further increase efficiency in the design of Energy efficient motors
Energy efficient motors should be considered for all new installations, replacement of failed motors, or as spares. Energy efficient motors are frequently a cost-effective alternative to rewinding
and are sometimes an economic substitute for well-functioning motors in high-duty applications.
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Reverse osmosis is the process of forcing a solvent from a region of high solute concentration through a membrane to a region of low solute concentration by applying a pressure in excess of the osmotic pressure. This is the reverse of the normal osmosis process, which is the natural movement of solvent from an area of low solute concentration, through a membrane, to an area of high solute concentration when no external pressure is applied. The membrane here is semipermeable, meaning it allows the passage of solvent but not of solute.
To illustrate, imagine a semi permeable membrane with fresh water on one side and a concentrated aqueous solution on the other side. If normal osmosis takes place, the fresh water will cross the membrane to dilute the concentrated solution. In reverse osmosis, pressure is exerted on the side with the concentrated solution to force the water molecules across the membrane to the fresh water side.
The membranes used for reverse osmosis systems have a dense polymer barrier layer in which separation takes place. Since Reverse Osmosis does not occur naturally, it must be created by applying pressure to the high solids water in order to force it through the membrane, with pressures from 8 – 14 bar for fresh and brackish water, and 40 – 70 bar for seawater, which has around 24 bar (350 psi) natural osmotic pressure which must be overcome.
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